вход по аккаунту


Патент USA US2122463

код для вставки
Juiy 5;, E9358”
(1. s. FULLER
2,122,463 v.
Filed March 27, 1936
Patented July 5, 1938
2,122,463‘ ~
METHOD or ammmnc wrae
Calvin s. ‘Fuller, Summit, n.1, assignor to Bell
Telephone , laboratories,
Incorporated, New
York, N. Y., a corporation 0! New York
Application March 27, 1936, Serial No. 71,149
5 Glaims.
(O1. . 91-9-70)
su?lcient current to cause arcing. The heat
ing effect of the current and the chemical effect
0! the arc destroy the particle or defect causing
the low resistance. The wire is then recoated in
In the process of coating electrical conductors any suitable manner and, if necessary, redrawn
with insulation, and, especially in the case of through the liquid electrode. The ?nal coating
coating wires with an enamel or the like, it is the ‘will cover up any craters‘formed by the electric
practice in somev instances to pass the wire current and will result in an improved and even
through a bath of suitable coating material one ly coated wire.
This invention will be more clearly under
or more times with a drying or baking operation
after each coating. However, it has been dis ‘ stood from the accompanying detailed descrip
covered that oftentimes ‘the resulting insulating tion and the drawing which shows in schematic
form apparatus for producing improved insu
coating contains numerous weak points and im
perfections which are due to the initial condi
As shown in the drawing, thewire I to be
tion of the wire being coated instead of improper
coated is wound upon spool 2 which is positioned
methods of applying the insulation. 'An exam
on shaft 3. The wire 5 passes over guide pulley
ination of such wire discloses considerable var
iability in its surface, there being ridges, slivers 4 around driving drum 5 to the tank 8 containing
and other such ?aws present. These irregular the insulating material H where it passes around
projections make it extremely di?‘icult to coat guide rollers ‘I and 8, and 9 and Ill, and receives
a coating of the insulating compound. The
with an even thickness of insulation. The result.
coated wire I then passes through a suitable dry
ing insulated wire on account of these imperfec
tions often has weak points at which the slivers ing or baking oven l2. Preferably the enameled
- etc., almost project through the insulation, or wire is baked in the oven l2 until dry. In many
uninsulated points at which the slivers actually cases the wire will be coated imperfectly and
This invention relates to electrical conductors
and more particularly to a method of coating
conductors with insulation such as enamel insu
extend through the coating. While for some uses
such defects in insulation may be negligible, in
others such as in the manufacture of relay coils,
cables and the like wherein turns of wire are
tightly positioned together, these defects mate
rially reduce the efficiency and life of the ap
An object, therefore, of the present invention
is an insulated wire having substantially no de
fects in the insulated coating.
Another object of the invention is a method of
electrolyte or mercury. The wire enters and
leaves this receptacle 15 through slits l8 and IS
container through the slits. '
coating such as an enamel coating and then
passing the coated wire through a current carry
ing liquid such .as mercury or an electrolyte. A
potential is applied between the wire and the
liquid electrode. As each defect in the insula
tion passes through the liquid electrode the pro
jecting slivers and‘ the like are subjected to a
l3 and through the current carrying liquid N
which is held in a suitable receptacle I5. While
this receptacle may be of any suitable con
struction, it has been found satisfactory to form
the bottom I 6 of metal and the sides I‘! of soft
rubber. The current carrying liquid may be an
A further object of the invention is a com
bined process of continuously improving the sur
face condition of the wire and coating the ‘wire.
Still another object of the invention is a pro
cess of removing defects in the surface of the
In accordance with the present invention,
these and other objects are attained by coating
a wire by any suitable process with an insulating
the coating. On emerging from the baking oven
l2, the coated wire passes around driving drum
in the rubber walls and does not come in con
tact with the metal base IS. The elastic rubber
layers of insulation. -
slivers and other projections will extend through
improving the surface condition of the wire
'prior to coating with a ?nal insulating layer.
wire after it has been coated with one or more
walls grip the wire tightly and prevent any of
the current carrying liquid N from leaving the 40
A potential is applied to the coated wire and
to the conducting ?uid and when a projection
on the wire extends through the insulation and
contacts with the conducting liquid current flows
through this projection and over the wire. As
shown in the drawing, a potential is applied to
the conducting liquid from generator 20 through
the windings 2i and 22 of the transformer over
conductor 23 to the base IS which is in contact 50
with liquid N. One side of the transformer
winding 22 is grounded at 21. The wire I is
grounded at 25 through drum '5, shaft 28 and
contact 24.
This permits a current to flow from.
transformer 28 through the conducting liquid 55.
ll over the slivers which project throughv the
initial insulating coating and over the wire to
ground ‘2|. Since the slivers are small, they
will be destroyed by the heating eil’ect of the
current and also by the arcing formed at that
point. The wire will now have a very small
crater in the coating in place of the sliver and
this is illled up by a subsequent coating of
enamel. The wire‘is carried around drum 5 a
10 second time and again passes through the tank
containing the insulating material where it re
ceives a second coating and through baking oven
12, around drum II and to the current carrying
liquid ll where any remainingslivers or other
15 such defects are removed electrically. ‘~ The wire
again passes around drum I and is given a ?nal
coating of- insulation and the coating is baked
on in oven II. On leaving oven II, the wire is
conducted over drum I! to guide pulley 28. and is
wound upon spool 43 which is turned by shaft 26.
It is, of course, obvious that the apparatus may
be enlarged so that the wire may be passed
through the liquid electrodes and coating bath
as many times as is desirable, and that it can
be constructed so that more than one wire can
be enameled at a time.
As shown in the drawing, the drums l and II
are driven at the same rate by motor 30 through
gears ii and 32, shaft 3!, gears I4 and 35, shaft
36, gears 31 and 38 and shaft 28; and gears 39
and-l0 and shaft ‘I. The take-up spool 43 is
also driven by motor 30 through the train’ of
gearing mentioned above ‘and shaft 36 which
carries friction clutch 42. when shaft 41 is
turned, it turns gears 45 and 46 which rotate
spool 43 through shaft 28., As an increased num
ber of turns of wire is takenup on spool l3 slip
page of friction clutch 42 will increase thereby
compensating for the increase in eifective diam
through a liquid electrode,-applying a potential
between the wire and. electrode sufficient to re
duce any metallic projections of the wire through
the coating and subsequently recoating the wire.
2._ The method of improving the continuity of
insulation on wire which comprises coating the
wire with insulation, baking said coating in an
oven, passing the coated wire through a liquid
electrode, applying a potential between the wire
and electrode sufficient to reduce any projec- I
tions of the wire through the coating, and sub
sequently coating and baking the coated wire a
second time.
. 3. The methodiof improving the continuity of
insulation on wire which comprises coating the j
wire with insulation, baking said coating in an
oven, subjecting the coated wire while it is pass
ing through mercury to a suillcient potential to
remove substantially any projections of the wire
through the insulation, and ?lling in any voids
in the insulating coating by recoating the wire.
4. The method of improving the continuity of
insulation on wire which comprises coating the
wire with enamel, baking said coating in an oven
until dry, subjecting the enameled wire while it
is passing through mercury to asu?icient poten
tial to remove substantially any portions of the
wire extending through the insulation, and fill
ing in any voids in the enamel coating by re
coating the wire.
5. The method of manufacturing insulated
wire comprising coating the wire with insu
lation, immersing the coated wire in a
bath of mercury, impressing a suilicient po
tential across the wire and the bath to reduce
substantially metallic projections of the wire
protruding through said coating, applying a sec
ond coating of insulation to the wire, immersing
the wire with the second coating of insulation
eter of the spool 43 and preventing undue ten- 1 thereon in a bath of mercury, impressing a suffi
sion on the coated wire.
cient potential across the wire and the bath
What is claimed is:
1. The method of improving the continuity of ,
through the coating and applying a third coat
ing of insulation to the wire.
‘insulation on wire which comprises coating the
wire with insulation,‘ passing the coated wire
Без категории
Размер файла
303 Кб
Пожаловаться на содержимое документа